:root {
  --navy: #17324d;
  --blue: #2676b8;
  --paper: #f5f7f8;
  --white: #ffffff;
  --slate: #5d6a75;
  --max-width: 1180px;
  --header-height: 78px;
  --radius: 6px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--paper); }
body { margin: 0; color: var(--navy); background: var(--white); font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif; font-size: 16px; line-height: 1.65; -webkit-font-smoothing: antialiased; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.container { width: min(calc(100% - 40px), var(--max-width)); margin: 0 auto; }
.skip-link { position: fixed; left: 16px; top: -100px; z-index: 1000; padding: 10px 16px; color: var(--white); background: var(--navy); }
.skip-link:focus { top: 12px; }

.site-header { position: sticky; top: 0; z-index: 100; height: var(--header-height); border-bottom: 1px solid color-mix(in srgb, var(--navy), transparent 88%); background: color-mix(in srgb, var(--white), transparent 4%); backdrop-filter: blur(12px); }
.header-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark { position: relative; width: 42px; height: 42px; display: grid; place-items: center; flex: 0 0 auto; color: var(--white); background: var(--navy); border-radius: 4px 12px 4px 4px; }
.brand-mark::after { content: ""; position: absolute; inset: 5px; border: 1px solid color-mix(in srgb, var(--white), transparent 68%); border-radius: 2px 8px 2px 2px; }
.brand-mark span { position: relative; z-index: 1; font-size: 20px; font-weight: 700; line-height: 1; }
.brand-text { display: flex; flex-direction: column; gap: 1px; }
.brand-text strong { font-size: 16px; letter-spacing: .08em; line-height: 1.3; }
.brand-text small { color: var(--slate); font-family: Arial, sans-serif; font-size: 9px; letter-spacing: .13em; line-height: 1.2; }
.site-nav { display: flex; align-items: center; gap: 34px; font-size: 14px; font-weight: 600; }
.site-nav a { position: relative; padding: 10px 0; }
.site-nav a:not(.nav-contact)::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 4px; height: 2px; background: var(--blue); transition: right .25s ease; }
.site-nav a:hover::after, .site-nav a:focus-visible::after, .site-nav a.active::after { right: 0; }
.site-nav .nav-contact { padding: 9px 18px; color: var(--white); background: var(--navy); border-radius: 3px; }
.menu-toggle { display: none; width: 42px; height: 42px; padding: 10px; border: 0; background: transparent; cursor: pointer; }
.menu-toggle span { display: block; width: 22px; height: 2px; margin: 5px auto; background: var(--navy); transition: transform .2s ease, opacity .2s ease; }

.hero { padding: 70px 0 82px; overflow: hidden; background: var(--paper); }
.hero-grid { display: grid; grid-template-columns: .88fr 1.12fr; align-items: center; gap: 70px; }
.eyebrow { margin: 0 0 18px; color: var(--blue); font-size: 13px; font-weight: 700; letter-spacing: .16em; }
.hero h1, .section h2, .contact h2 { margin: 0; font-weight: 700; line-height: 1.3; letter-spacing: -.03em; text-wrap: balance; }
.hero h1 { max-width: 600px; font-size: clamp(38px, 4.25vw, 62px); }
.hero-intro { max-width: 590px; margin: 26px 0 0; color: var(--slate); font-size: 17px; line-height: 1.9; }
.hero-actions { display: flex; align-items: center; gap: 28px; margin-top: 34px; }
.button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; padding: 0 24px; border: 1px solid transparent; border-radius: 3px; font-size: 15px; font-weight: 700; transition: transform .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: var(--white); background: var(--blue); }
.button-primary:hover { background: var(--navy); }
.text-link { color: var(--navy); font-size: 15px; font-weight: 700; }
.text-link span { display: inline-block; margin-left: 7px; color: var(--blue); transition: transform .2s ease; }
.text-link:hover span { transform: translateX(4px); }
.hero-points { display: flex; gap: 26px; margin: 32px 0 0; padding: 24px 0 0; border-top: 1px solid color-mix(in srgb, var(--navy), transparent 84%); list-style: none; }
.hero-points li { display: flex; align-items: center; gap: 8px; color: var(--slate); font-size: 13px; font-weight: 600; }
.hero-points li::before { content: ""; width: 6px; height: 6px; background: var(--blue); border-radius: 50%; }
.hero-visual { position: relative; min-width: 0; }
.hero-visual::before { content: ""; position: absolute; width: 68%; height: 106%; right: -10%; top: -3%; border: 1px solid color-mix(in srgb, var(--blue), transparent 52%); z-index: 0; }
.hero-visual img { position: relative; z-index: 1; width: 100%; aspect-ratio: 8 / 5; object-fit: cover; box-shadow: 18px 22px 0 color-mix(in srgb, var(--navy), transparent 90%); }
.visual-note { position: absolute; z-index: 2; left: -36px; bottom: -34px; min-width: 230px; padding: 18px 20px; color: var(--white); background: var(--navy); }
.visual-note span, .visual-note strong { display: block; }
.visual-note span { margin-bottom: 2px; color: color-mix(in srgb, var(--white), transparent 35%); font-size: 12px; }
.visual-note strong { font-size: 17px; letter-spacing: .05em; }

.intro-strip { color: var(--white); background: var(--navy); }
.intro-strip-inner { min-height: 96px; display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.intro-strip p { max-width: 800px; margin: 0; color: color-mix(in srgb, var(--white), transparent 18%); font-size: 15px; }
.intro-strip a { flex: 0 0 auto; font-size: 14px; font-weight: 700; }
.intro-strip a span { margin-left: 6px; color: var(--blue); }

.section { padding: 108px 0; }
.section-heading { display: grid; grid-template-columns: 1fr .72fr; align-items: end; gap: 80px; margin-bottom: 52px; }
.section h2, .contact h2 { font-size: clamp(32px, 3.4vw, 48px); }
.section-heading > p { max-width: 460px; margin: 0 0 4px; color: var(--slate); line-height: 1.9; }
.services { background: var(--white); }
.service-grid { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid color-mix(in srgb, var(--navy), transparent 82%); border-left: 1px solid color-mix(in srgb, var(--navy), transparent 82%); }
.service-card { min-height: 330px; padding: 34px 38px; border-right: 1px solid color-mix(in srgb, var(--navy), transparent 82%); border-bottom: 1px solid color-mix(in srgb, var(--navy), transparent 82%); transition: background .25s ease, transform .25s ease; }
.service-card:hover { background: var(--paper); transform: translateY(-3px); }
.service-index { color: var(--blue); font-family: Arial, sans-serif; font-size: 12px; font-weight: 700; }
.service-card h3 { margin: 26px 0 12px; font-size: 23px; line-height: 1.4; }
.service-card p { max-width: 490px; margin: 0; color: var(--slate); line-height: 1.85; }
.service-card ul { display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 24px 0 0; padding: 20px 0 0; border-top: 1px solid color-mix(in srgb, var(--navy), transparent 88%); list-style: none; }
.service-card li { color: var(--navy); font-size: 13px; font-weight: 600; }
.service-card li::before { content: "—"; margin-right: 6px; color: var(--blue); }

.scene-section { background: var(--paper); }
.scene-grid { display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 86px; }
.scene-image { position: relative; padding: 0 20px 20px 0; }
.scene-image::after { content: ""; position: absolute; right: 0; bottom: 0; width: 45%; height: 42%; background: var(--blue); z-index: 0; }
.scene-image img { position: relative; z-index: 1; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.scene-copy > p:not(.eyebrow) { margin: 26px 0 0; color: var(--slate); line-height: 1.9; }
.principles { margin-top: 34px; border-top: 1px solid color-mix(in srgb, var(--navy), transparent 82%); }
.principles div { display: grid; grid-template-columns: 66px 1fr; gap: 18px; padding: 18px 0; border-bottom: 1px solid color-mix(in srgb, var(--navy), transparent 82%); }
.principles strong { color: var(--blue); }
.principles span { color: var(--slate); font-size: 14px; }

.process { color: var(--white); background: var(--navy); }
.process .eyebrow { color: color-mix(in srgb, var(--blue), var(--white) 30%); }
.process-heading > p { color: color-mix(in srgb, var(--white), transparent 28%); }
.process-list { display: grid; grid-template-columns: repeat(4, 1fr); margin: 58px 0 0; padding: 0; border-top: 1px solid color-mix(in srgb, var(--white), transparent 75%); list-style: none; }
.process-list li { position: relative; min-height: 240px; padding: 32px 26px 20px 0; border-right: 1px solid color-mix(in srgb, var(--white), transparent 84%); }
.process-list li:not(:first-child) { padding-left: 26px; }
.process-list li:last-child { border-right: 0; }
.process-list li::before { content: ""; position: absolute; top: -5px; left: -1px; width: 9px; height: 9px; background: var(--blue); border-radius: 50%; }
.process-list li:not(:first-child)::before { left: 25px; }
.process-list > li > span { color: color-mix(in srgb, var(--white), transparent 58%); font-family: Arial, sans-serif; font-size: 12px; }
.process-list h3 { margin: 40px 0 14px; font-size: 21px; }
.process-list p { margin: 0; color: color-mix(in srgb, var(--white), transparent 34%); font-size: 14px; line-height: 1.8; }

.about { background: var(--white); }
.about-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 110px; }
.about-content { padding-top: 44px; }
.about-content p { color: var(--slate); line-height: 1.95; }
.about-content .about-lead { margin-top: 0; color: var(--navy); font-size: 22px; line-height: 1.7; }
.commitment-row { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 38px; padding-top: 28px; border-top: 1px solid color-mix(in srgb, var(--navy), transparent 82%); }
.commitment-row span, .commitment-row strong { display: block; }
.commitment-row span { margin-bottom: 7px; color: var(--slate); font-size: 12px; }
.commitment-row strong { font-size: 16px; }

.contact { padding: 90px 0; color: var(--white); background: var(--blue); }
.contact .eyebrow { color: color-mix(in srgb, var(--white), transparent 18%); }
.contact-inner { display: grid; grid-template-columns: 1.15fr .85fr; align-items: end; gap: 90px; }
.contact-copy { padding-bottom: 6px; }
.contact-copy p { margin: 0 0 28px; color: color-mix(in srgb, var(--white), transparent 14%); line-height: 1.85; }
.button-light { color: var(--navy); background: var(--white); }

.site-footer { padding-top: 64px; color: var(--white); background: var(--navy); }
.footer-main { display: flex; align-items: center; justify-content: space-between; gap: 40px; padding-bottom: 46px; }
.footer-brand { display: flex; align-items: center; gap: 16px; }
.brand-mark-light { color: var(--navy); background: var(--white); }
.brand-mark-light::after { border-color: color-mix(in srgb, var(--navy), transparent 72%); }
.footer-brand strong { font-size: 17px; letter-spacing: .05em; }
.footer-brand p { margin: 4px 0 0; color: color-mix(in srgb, var(--white), transparent 48%); font-size: 12px; }
.footer-nav { display: flex; gap: 28px; color: color-mix(in srgb, var(--white), transparent 25%); font-size: 13px; }
.footer-nav a:hover { color: var(--white); }
.footer-bottom { display: flex; justify-content: space-between; gap: 30px; padding: 20px 0 26px; border-top: 1px solid color-mix(in srgb, var(--white), transparent 84%); }
.footer-bottom p { margin: 0; color: color-mix(in srgb, var(--white), transparent 50%); font-size: 12px; }

.reveal { opacity: 0; transform: translateY(18px); transition: opacity .65s ease, transform .65s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

@media (max-width: 960px) {
  :root { --header-height: 70px; }
  .menu-toggle { display: block; position: relative; z-index: 2; }
  .menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .site-nav { position: fixed; top: var(--header-height); left: 0; right: 0; display: flex; flex-direction: column; align-items: stretch; gap: 0; padding: 12px 20px 22px; border-bottom: 1px solid color-mix(in srgb, var(--navy), transparent 85%); background: var(--white); transform: translateY(-120%); visibility: hidden; transition: transform .25s ease, visibility .25s; }
  .site-nav.open { transform: translateY(0); visibility: visible; }
  .site-nav a { padding: 12px 0; }
  .site-nav .nav-contact { margin-top: 8px; text-align: center; }
  .hero { padding: 56px 0 76px; }
  .hero-grid, .scene-grid, .about-grid { grid-template-columns: 1fr; gap: 58px; }
  .hero-visual { width: calc(100% - 20px); margin-left: auto; }
  .section-heading { grid-template-columns: 1fr; gap: 24px; }
  .process-list { grid-template-columns: repeat(2, 1fr); }
  .process-list li:nth-child(2) { border-right: 0; }
  .process-list li:nth-child(n+3) { border-top: 1px solid color-mix(in srgb, var(--white), transparent 84%); }
  .process-list li:nth-child(3) { padding-left: 0; }
  .process-list li:nth-child(3)::before { left: -1px; }
  .about-content { padding-top: 0; }
  .contact-inner { grid-template-columns: 1fr; gap: 34px; }
}

@media (max-width: 640px) {
  .container { width: min(calc(100% - 32px), var(--max-width)); }
  .brand-text strong { font-size: 14px; }
  .brand-text small { display: none; }
  .hero { padding-top: 42px; }
  .hero h1 { font-size: 38px; }
  .hero-intro { font-size: 15px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 18px; }
  .hero-points { justify-content: space-between; gap: 10px; }
  .hero-points li { font-size: 12px; }
  .visual-note { left: -16px; bottom: -30px; min-width: 205px; }
  .intro-strip-inner { align-items: flex-start; flex-direction: column; gap: 16px; padding: 25px 0; }
  .section { padding: 76px 0; }
  .section h2, .contact h2 { font-size: 34px; }
  .service-grid { grid-template-columns: 1fr; }
  .service-card { min-height: auto; padding: 30px 24px; }
  .scene-grid { gap: 44px; }
  .scene-image { padding: 0 12px 12px 0; }
  .process-list { grid-template-columns: 1fr; }
  .process-list li, .process-list li:not(:first-child), .process-list li:nth-child(3) { min-height: auto; padding: 30px 0; border-right: 0; border-top: 1px solid color-mix(in srgb, var(--white), transparent 84%); }
  .process-list li::before, .process-list li:not(:first-child)::before, .process-list li:nth-child(3)::before { left: auto; right: 0; top: 34px; }
  .process-list h3 { margin-top: 16px; }
  .about-grid { gap: 34px; }
  .commitment-row { grid-template-columns: 1fr; }
  .contact { padding: 72px 0; }
  .footer-main { align-items: flex-start; flex-direction: column; }
  .footer-nav { flex-wrap: wrap; gap: 14px 24px; }
  .footer-bottom { flex-direction: column; gap: 7px; }
}